In vitro evidence for sodium-dependent pH regulation in sea lamprey (Petromyzon marinus) red blood cells

1992 ◽  
Vol 70 (3) ◽  
pp. 411-416 ◽  
Author(s):  
Bruce L. Tufts
Keyword(s):  
Carbon Dioxide ◽  
Blood Cells ◽  
Ph Regulation ◽  
Petromyzon Marinus ◽  
Sea Lamprey ◽  
Carbon Dioxide Tension ◽  
Factors Influencing ◽  
Rate Of Increase ◽  
Sodium Dependent

Factors influencing the pH of sea lamprey (Petromyzon marinus) erythrocytes were examined in vitro. The absence of extracellular Na+ caused a significant reduction in the erythrocyte pH. In addition, the protonophore 2,4-dinitrophenol was capable of reducing the erythrocyte pH when it was dissolved in dimethyl sulfoxide. In the presence of ouabain, a step increase in the carbon dioxide tension caused a large increase in the intracellular Na+ concentration, but the rate of increase was considerably reduced after the 1st hour. Even in the absence of ouabain, however, the intracellular Na+ concentration in erythrocytes equilibrated with 3% CO2 is much greater than that in erythrocytes equilibrated with 0.2% CO2. Together, these results suggest that Na+-dependent H+ movements, possibly Na+–H+ exchange, may have an important role in erythrocyte pH regulation in P. marinus. Moreover, the mechanism appears to be stimulated by the decrease in extracellular or erythrocyte pH associated with the increase in [Formula: see text]. Extracellular Na+ also has a significant impact on the CO2-transport properties of P. marinus blood. In the absence of extracellular Na+, the intracellular total CO2 concentration was significantly reduced, whereas extracellular total CO2 concentration, [Formula: see text], was significantly increased. Furthermore, in the no-Na+ saline, [Formula: see text] became dependent on the hematocrit; an increase in the number of erythrocytes resulted in an increase in [Formula: see text]. This result suggests that the erythrocyte membrane of P. marinus may be permeable to [Formula: see text].

scholarly journals IN VITRO INTERACTIONS BETWEEN OXYGEN AND CARBON DIOXIDE TRANSPORT IN THE BLOOD OF THE SEA LAMPREY (PETROMYZON MARINUS)

1992 ◽  
Vol 173 (1) ◽  
pp. 25-41 ◽  
Author(s):  
R. A. Ferguson ◽  
N. Sehdev ◽  
B. Bagatto ◽  
B. L. Tufts
Keyword(s):  
Carbon Dioxide ◽  
Blood Cell ◽  
Red Blood Cells ◽  
Red Blood Cell ◽  
Whole Blood ◽  
Blood Cells ◽  
Sea Lamprey ◽  
Carbon Dioxide Transport ◽  
Dissociation Curves

In vitro experiments were carried out to examine the interactions between oxygen and carbon dioxide transport in the blood of the sea lamprey. Oxygen dissociation curves for whole blood obtained from quiescent lampreys had Hill numbers (nH) ranging from 1.52 to 1.89. The Bohr coefficient for whole blood was -0.17 when extracellular pH (pHe) was considered, but was much greater (-0.63) when red blood cell pH (pHi) was considered. The pHi was largely dependent on haemoglobin oxygen- saturation (SO2) and the pH gradient across the red blood cell membrane was often reversed when PCO2 was increased and/or SO2 was lowered. The magnitude of the increase in pHi associated with the Haldane effect ranged from 0.169 pH units at 2.9 kPa PCO2 to 0.453 pH units at a PCO2 of 0.2 kPa. Deoxygenated red blood cells had a much greater total CO2 concentration (CCO2) than oxygenated red blood cells, but the nonbicarbonate buffer value for the red blood cells was unaffected by oxygenation. Plasma CCO2 was not significantly different under oxygenated or deoxygenated conditions. Partitioning of CO2 carriage in oxygenated and deoxygenated blood supports recent in vivo observations that red blood cell CO2 carriage can account for much of the CCO2 difference between arterial and venous blood. Together, the results also suggest that oxygen and carbon dioxide transport may not be tightly coupled in the blood of these primitive vertebrates. Finally, red cell sodium concentrations were dependent on oxygen and carbon dioxide tensions in the blood, suggesting that sodium-dependent ion transport processes may contribute to the unique strategy for gas transport in sea lamprey blood.

Haemocytology of the supraneural myeloid body in the sea lamprey during several phases of life cycle

1974 ◽  
Vol 52 (12) ◽  
pp. 1585-1589 ◽  
Author(s):  
J. C. George ◽  
F. W. H. Beamish
Keyword(s):  
Blood Cells ◽  
Petromyzon Marinus ◽  
Cell Types ◽  
Sea Lamprey ◽  
Histochemical Staining ◽  
Fat Cells ◽  
Cell Type ◽  
Adult Tissue ◽  
Spawning Run ◽  
Early Phases

The supraneural myeloid body of the sea lamprey (Petromyzon marinus) was studied in the feeding adult, late spawning run adult, and metamorphosing ammocoete. The fatty nature of the tissue was established by histochemical staining and electron microscopy. The presence of the fat cells and the actively differentiating blood cells evinced its similarity to the bone marrow in higher animals, thereby suggesting a phylogenetic affinity. In the late spawning run lampreys, the tissue was found to be almost empty of blood cells, leaving empty spaces within the stromal skeleton. In the feeding adult tissue, the various blood cell types differentiated from precursor cells have been identified. Megakaryoblasts possibly representing early phases of the cell type were observed only in the transforming (macrophthalmia stage) and adult lampreys. A marked active development of the tissue in the ammocoete was seen only at the fourth stage of the metamorphosing ammocoete immediately before macrophthalmia. At the macrophthalmia stage, the haematopoietic activity in the tissue increased substantially.

scholarly journals Humoral Factors Influencing Erythropoiesis in the Fish (Blue Gourami—Trichogaster trichopterus)

Blood ◽  
1969 ◽  
Vol 33 (4) ◽  
pp. 573-581 ◽  
Author(s):  
ESMAIL D. ZANJANI ◽  
MAN-LIM YU ◽  
ALFRED PERLMUTTER ◽  
ALBERT S. GORDON
Keyword(s):  
Body Weight ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Test Animal ◽  
Humoral Factors ◽  
Highly Active ◽  
Factors Influencing ◽  
Lower Vertebrates ◽  
Stimulating Factor

Abstract Evidence is presented for the existence of a circulating erythropoiesis stimulating factor in the bled fish (blue gourami). Erythropoiesis is inhibited by starvation and increased following a single bleeding in the gourami. Administration of serum from the bled gourami to the starved gourami evokes a highly significant increase in erythropoiesis. Serum from normal non-bled fish fails to produce this effect. Large doses of sheep plasma ESF and human urinary ESF (16 units/100 Gm. body weight) stimulate erythropoiesis in the starved gourami. Smaller amounts, highly active in the polycythemic mouse, are without effect in the gourami. No in vitro stimulatory effect on radioiron uptake by peripheral red blood cells of the gourami was exerted by anemic gourami serum or mammalian ESF. The starved gourami may find use as a test animal for erythropoietic factors from other lower vertebrates.

15α-Hydroxytestosterone produced in vitro and in vivo in the sea lamprey, Petromyzon marinus

2003 ◽  
Vol 132 (3) ◽  
pp. 418-426 ◽  
Author(s):  
Mara B. Bryan ◽  
Alexander P. Scott ◽  
Ivan Černý ◽  
Sang Seon Yun ◽  
Weiming Li
Keyword(s):  
Petromyzon Marinus ◽  
Sea Lamprey

The effect of acid–base changes on skeletal muscle twitch tension

1978 ◽  
Vol 56 (4) ◽  
pp. 543-549 ◽  
Author(s):  
David W. Fretthold ◽  
Lal C. Garg
Keyword(s):  
Carbon Dioxide ◽  
Skeletal Muscle ◽  
Intracellular Ph ◽  
Muscle Tension ◽  
Carbon Dioxide Tension ◽  
Extracellular Ph ◽  
Acid Base ◽  
Muscle Twitch ◽  
Deficient Diet

The effects of acid–base alterations produced by changing bicarbonate (metabolic type), carbon dioxide tension (respiratory type), or both bicarbonate and carbon dioxide tension (compensated type) on skeletal muscle twitch tension, intracellular pH, and intracellular potassium were studied in vitro. Hemidiaphragm muscles from normal rats and rats fed a potassium-deficient diet were used. Decreasing the extracellular pH by decreasing bicarbonate or increasing CO2 in the bathing fluid produced a decrease in intracellular pH, intracellular K+, and muscle twitch tension. However, at a constant extracellular pH, an increase in CO2 (compensated by an increase in bicarbonate) produced an increase in intracellular K+ and twitch tension in spite of a decrease in intracellular pH. The effect on twitch tension of the hemidiaphragms showed a rapid onset, was reversible, persisted until the buffer composition was changed, and was independent of synaptic transmission.It is concluded that the twitch tension of the skeletal muscle decreases with a decrease in intracellular K+. The muscle tension also decreases with an increase in the ratio of intracellular and extracellular H+ concentration. However, there is no consistent relationship between muscle tension and extracellular or intracellular pH. The muscle tension of the diaphragms taken from K+-deficient rats is more sensitive to variations in CO2, pH, and bicarbonate concentration of the medium than that of the control rat diaphragms.

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